Method of making casting-patterns.



Ml E. FERNALD.

METHOD 0F MAKING CASTING PATTERNS.

APPLICATION FILED 00T. I. 1915.

1,266, l l 3., 'Patented May 14, 1918.

2 SHEETS-SHEET i.

IVI. E. FERNALD.

METHOD 0F MAKING CASTING PATTERNS.

, APPLICATION FILED ocT. l. 1915.

Yl ,266, l l 3 l Patented May 14, 1918.

2 SHEETS- SHEET 2.

[fil/@172374 iria-l? PATENT OFFQE.

MARK E. FERNALD, OF SAUGUS, MASSACHUSETTS, ASSIGNOR TO C. C. BLAKE, INCORPO- RATED, OF BOSTON, LASSACHSETTS, A CORPORATION OF NEW YORK.

METHOD OF MAKING CASTING-PATTERNS.

Specication of Letters Patent.

Patented May te, 1918.

Application filed October 1, 1915. Serial No. 53,639.

To 'ZZ 1071.01 t may concern Bc it known that I, MARK E. FERNALD, a citizen of the United States, residing at Saugus, in the county of Essex and State of Massachusetts, have. invented a new and useful improvement in Methods of Making Casting-Patterns; of which the following is a specification.

The present invention relates to methods for making casting patterns and more particularly to a method for making the casting patterns which determine the form of the leaders used in aut-ol'natic shoe machines and other sole-shaped devices having peripheral flanges thereon Such, for insta-nce, as sole cutting dies.

It has been proposed to perform the various c'')erations in the manufacture of shoes automatically. ln one system of automatic shoe machines the transfer of the point of operation of the tool along the work is controlled by a leader upon which the work supporting jack is mounted. These leaders usually comprise a. body portion having the same form on one face as the sole of the shoe mounted upon the jack, a flange on the edge of the body portion which is usually provided with teeth for engagement Yith the driving pinion and a bevel formed above the teeth on the exterior face of the flange at the upper side thereof. The flange alsoacts as a guide for swinging the jack laterally to permit the tool to traverse the reverse curves of the work. One of the principal objections to the use of ythese automatic machines is the cost of producing these leaders which vary in size and shape with the various sizes and styles of soles intended to be incorporated into a shoe. As well known to those skilled in the art it is necessary in making a casting pattern to allow for the shrinkage in the casting. Furthermore, in making a leader for a shoe machine it is also necessary to allow for the spring of the last. upon which the solo to be incorporated into the shoe is secured. The principal reason for the high cost of these leaders is that heretofore it has been necessary to employ a skilled pattern maker `iu order to produce a leader casting pattern having the metal shrinkage and the spr-ing"7 of thc last measurements incorporated therein.

The object of the present invent-ion is to provide a simple, cheap and effective method by means of which t-he casting patterns which determine the form of the leaders employed in automatic shoe machines may be manufactured without the aid of a pattern maker or other skilled labor.

To the accomplishment of this object and the production of a novel casting pattern the features of the invention relate to certain methods, devices, combinations and arrangements of parts hereinafter described and then set forth broadly and in detail in the appended claims which possess advantages readily apparent to those skilled in the art.

The various features of the present invention will be readily understood from an inspection of the accompanying drawings showing the best method of practising the invention at present known to the inventor, in which,

Figure l is a front elevation of a machine for winding paper about the edge of a soleshaped blank to build a fiange thereon;

Fig. 2 is a sectional elevation of the casting pattern after being operated upon by the winding machine;

Fig. 3 is an elevation, partly in section, of a machine for imparting a draft to the flange of the casting pattern; f

Fig. l is an elevation, partly in section, of a machine for beveling the exterior face of the flange at the upper end thereof;

Fig. 5 is a. plan of the finished casting pattern; and

Fig. 6 is a sectional elevation of the finished casting pattern.

Describing now in general terms my novel method of making casting patterns which determine the form of the leaders employed in automatic shoe machines, the first step consists in the production of thel flat blank for the foundation of the pattern. The fiat sole-shaped blank haring the shrinkage of cast iron and the spring of the last measurements incorporated therein may be produced by projecting the edge of a sole on the last upon a plane and then enlarging the area thus produced by the amount of the shrinkage of the metal used for casting the leader. Preferably l produce the blank by means of the geometrical instrument disclosed in application for Letters Patent of the United States `filed by me March 22, 1915, Serial No. 16,05%). In this machine a feeler travels around the peripheral edge shaft Q3 journalcd in the legs of a bifurcatcd arm 2i Which is piroted at 25 on the machine frame. A finger 26 depending from the arm 2l insures the contact of a substantial length of paper with the roll 19. The

roll normally pressed against the paper on the roll 19 by a coiled spring 27 one end of which is connected with the arm 2l and the other ond of which is connected to the machine frame. The shaft of the rolls 19 and 2:3 carry gears 28 and 29, respectively, normally intermeshed so that as the paper is fed by the rotation of the blank to Which it is attached the rolls will rotate together'. ln order to separate the rolls, when the operating tools are held out of their operating position, so as to permit the ready introduction of the paper between them the arin 9 carries a pin 30 which, as the arm is being elevated to latch the dog l2 on the lug 13, contacts with an extension 3l of one of the legs of the bifurcated arm 2e thereby separating the rolls 19 and Q2 and disconnecting the gears and 29,

After the paper has been rendered tacky by the nioistening apparatus the paper is led o Ver the roll 22 to brin g its tacky face uppermost and is then led over av roll 32 and between a paiil of pins mounted on a plate 3l. The plate 3l normally rests at one end upon a pin carried by the arm 9 and its other end is bifurcated so that it may straddle the roll l1 and rest upon the upper face of the roll carrier 7. Connected to the rear of the arm of the bifurcated plate. 34 is a pair of lugs 36 by means of which the plate El is pivoted upon the stud bolt 8. The paper is then led between the roll 6 and a bridge 37 on the roll carrier 7 to the point of operation at which one end of the tacky paper is attached to the blank.

After one end of the paper has been initially attached to the edge of the blank and the operatin tools depressed to engage the attached paper the machine is thrown into operation to rotate the blank to transthe point of operation. of the tools around the blank to drauf' an additional supply of paper from the roll l5. During the transfer of the point of ope-ration of the tools around the blank the roll carrier 7 automatically t" s on. the bolt S to maintain the tools sul'isl'antially normal to the point of operation as illiruated in Fig'. l. is the blank beine* operated upon sole-shaped, there is a tendency for the paper to drum head across the shank portion of the blank owing to the tension placed upon the paper by the rotation. of the blank. 'lo overcome this tendency the roll carrier 7 as it tips to maintain the roll substantial to the point of operation of the toe and heel portions of the blank actuales the plate Bil to pull upon the supply end of the paper so as to produce slack in the paper as illustrated in F ig. l

and thus enable the rolls to attach the paper to thc shank portion of the blank While the paper is free from tension. The plate 34. returns under the influence of gravity to its original position as soon the carrier tips in the opposite direction during the: transfer of the rolls along the shank portion of the blank. rlhe plate Se is herein called a feed accelerator as it accelerates the feed of the strip due to the rotation of the blank during the transfer of the point of operation of the tools around the blank. The arm 9 Which supports thc roll carrier T swings on its pivot l0 to permit the rolls to travel around the ends of the blank and reach the shank portion. thereof. s illustrated. in Fig. l the a-Xis of the rotating blank l and the axis of the carrier 7 are located at eq ual distances from the axis of the support l0. This construction permits the rise and fall of the rolls 6 and ll under the influence of the rotating blank without danger of binding or prnducing excessive pressure as they reach the toe and heel portions of the blank, lt Will also be seen from an inspection of Fig. l that the journal for the roll G is located at a greater distance from the axis of the carrier T than the journal for the roll ll. By locating the journals for the rollsl G and ll at different distances fronrthe axis of the tipping carrier in the manner describedmost of the weight of the arm 9 and its supporting parts is transmitted through the roll ll to the Work. This manner of mounting the rolls 6 and 1l insures the operation of the roll 6 under a light pressure to lay the paper in position and the operation of the roll il under a heavy pressure to :lix the paper laid by the roll (3.

The blank is rotated until a flange of the desired thickness is built upon the edge thereof at which time the supply end of the strip of paper is severed and the pattern removed from the machine. This pattern is illustrated somewhat exaggerated in ysection in Fig. 2. is shown it consists of a body portion 3S comprising the sole-shaped blank and a laminated fiange 39 Which has been. built upon the blank by Winding the strip of paper in layers around the peripheral edge of the blank.

ln order to impart the draft to tne flange and smooth the irregularities on the top and bottom faces of the flange the pattern is passed through a machine provided with a series of rolls which support7 O'uide, feed and operate automatically upon the pattern. as it passes through the machine. As shown in Fig. S3 these rolls comprise a pair of rolls Ll0 and lll which engage the top and bottom faces of the body portion of the pattern, respectively. and which are also constructed and arranged to engage the inner faces of the flange and impart the draft thereto. a pair of rolls l2 and 4:3 which engage the Cil Clt

Cil

ot the exterior :tace of the guiding flange. ln this machine the pattern is supported upon a. platen d and the pattern is ted over this platen by a pair of feed rolls il@ and il Which engage respectively the inner and outer faces ort the iiange. rThe feed ro is lo and il' are substantiall)Y truste-conical in shape in accordance W'th the shape ot the draft in the flange, viFrith this construction the rotation of the rolls elli and ell feeds the pattern over the platen' and also swings the pattern during the feed to maintain the rerersely curred portions of the flange in proXimity to the operating point in the line of feed. rlhe roll l is dished upon its upper tace 8 to permit the operation ot a rotar),T bell-shaped cutter stl) close to the roll. By employing a bell-shaped cutter and a feed roll having its upper :tace dislied on a curve concentric to the cutting edge ot the knife a bevel will be. Ytermed on the exterior tace ot the flange at the upper end hereof. The cutter rotates in a contr:w clockwise direction in order to torni a clean cut on the iiange. By rotating the cutter in this direction there is a tendency,Y for the cutter to litt the ,pattern from its support. To overcome this tendencyY a presser foot 5l is provided which engages the top iiace oi' the Vtlange close to the operating point. rThe Jroot 5l carried upon a guard 52 which covers the cutter 49. ritter the pattern is provided With the bevel 50 a iillet of bees- Wai; is placed in the angle at the juncture of the iiange and bod;T portion 38 (Fig. 6) in order to prevent the molders sand trom lodging in the cracks at these points. The pattern is then finished bi* prori ding it with a, coat oi shellac.

lllhile the illustrated embodiment of the present invention directed to` a method for use in making casting patterns for shoe machine leaders and for sole cutting dies it Will be apparent to those skilled in the art that the methods herein disclosed mai7 be advantageously employed in making; other kinds oi vliangod casting patterns.

The operations Which are iriertorined as abore described and illustrated arc those which are preferred in practising the pres-- Carles ofy this patent may be obtained for nre cents ent invention. lt. is to be understood, however, that except as defined in the claims the inrention is not limit-ed to the precise methods illustrated and described and that the steps of the methods may be i'aried or modiiied Without departing from the spirit of the'inrention.

lVhat is claimed as new, is 1- l. That improreinent in the art of .making patterns for casting the leaders used in automatic shoe machin es which consists in 'forining a suitable blank having the shrinkage oi a casting and the spring of a last measurements incorporated therein. attaching a strip or' material to the edge or the blank to iiorni a flange thereon, and imparting a draft to the flange,substantialljgT as described.

i2. if hat improvement in the art or' making patterns for casting the leaders used in automatic shoe machines which consists in forining a blank having the shrinkage of a asting and the spring of a last measurements incorporated thereii'x` building a flange on the blank by .rinding a strip or material around the edge of a blank, and imparting a drat't to the flange. substruitialh` as described.

3. That improvement in the art ot making casting patterns which consists in Joianing a suitable blank having the general shape oli' the desired casting. attaching paper thereto to shape the pattern to its inished form. and molding the paper to impart a draft to the pattern, substantiallyv as described.

L T hat improvement in the art of making patterns for casting the leaders used in automatic shoe machines Which consists in mounting a sole on the bottoni ot a last. and projecting the edge of the sole upon a plane substantiallj7 as described.

T hat improvement in the art of making` patterns for casting the leaders used in automatic shoe machines which consists in mounting a sole on the bottom of aV last. projecting the edge of the sole upon a plane. and enlarging the area Within the projections by the shrinkage of the metal used in the casting. substantiall i7 as described.

6. rilhat improvement in the art of making patterns for casting the leaders used in automatic shoe machines, Which consists in mounting a sole on the bottom oiC a last` projecting the edge ofthe sole upon a plane)` enlarging` the area Within the projections by the shrinkage of the metal used in the casting to produce a blank, attaching a strip of material to the edge of the blank to torni a Tdange thereon. and imparting a draft to the Harige.

MARK. E. FERNALD.

cach. by addressing the Commissioner of Patents,

"eshington,

l'lO 

